SimpliciTI network protocol, the low power RF protocol aimed at simple and small-scaled RF network is issued by America TI company. It is transplanted to design a wireless sensor network system in Keil MDK 3.8 software development enviroment。 The network system includes acess point and end device. In this system, STM32F103C8 is adopted as the microprocessor, coordinating with its ADF7021 wireless transceiver; the node hardware system is composed. SimpliciTI network protocol and its topological structure are analyzed and the software is designed based on the low power consumption design and carrier sense backoff algorithm. Thus, the network communication system based on SimpliciTI network protocol is implemented, which can be applied in single data collection center where the multiple sensor nodes.